// 不用引入的调用。
let number:Array<number> = new Array()

Math.pow(2,3)

// dom,bom
let boy = document.body


// 接口
interface age {
    name:string
    valuea:number
}
// 将属性变为可选
type person = Partial<age>
let person1 = {name:'123'}

// 忽略属性
type IQmit = Omit<age,'valuea'>
let number2:IQmit = {name:'123'}